Speed-limiting device for electrically-ignited explosive-engines.



No. 880,093. PATENTED FEB. 25, 1908. P. s. PERRIN. SPEED LIMITING DEVICE FOR BLEOTRIGALLY IGNITED EXPLOSIVE ENGINES.

APPLICATION FILED JAN. 9 1907.

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I To all whom it may concern:

FREDERIC STANTON PERRIN, OF NEW YORK, N. Y.

SPEED-LIMITING- DEVICE FOR ELECTRIGALLY-IGNITED EXPLOSIVE-ENGINES.

'Be it known that 'I, FREDERIC STANTON PERRIN, a citizen ofthe United States, and a resident of the city of New York, in the county of NewYork andState of New York,

have invented certain new and useful Im-' provements in Speed-Limiting Devices for Electrically- Ignited Explosive Engines, of

which the following is a specification.

My invention relates to improvements 1n devices for limiting the speed of electrically ignited explosive engines; and the object of my improvement is to prevent such an en gine, or vehicle propelled thereby, from exceeding a desired speed.

I attain my object by the mechanism and electric circuits illustrated in the accompanyto show the miles traveled drawing, in which igure 1 is a vertical section ofv a speed indicator commonly in use upon automobiles er hour, and an electrically ignited exploslve engine with electric circuits necessary for its operation.

Similar numbers refer to similar parts throughout the view.

The numerals 1 representsa sectional view of a speed indicator operated by centrifugal force. The flexible shaft 2 extends any desired length and has a small pinion attached to its extreme end (not shown in the drawing) that meshes with a gear upon the vehicle wheel, or engine shaft, which causes the flexible shaft 2 to revolve at a speed proportional to. the speed of the Wheel, or engine shaft, and swing the weights 23 and 24 at a s eed necessary to raisethem' by centrifugal fbrce against the tension of the spring 25 and cause 1 the index 4 torise upon the scale 3 and indicate the number of miles the vehicle is traveling, or the speed of the engine, according to the divisions upon the scale.

5 is an insulated contact point adapted to be clamped upon the frame of the speed indicator, at any point of the scale, in the path of the index 4; 6 indicates a battery; '7 is a switch; 8 represents an induction coil, and 9 Specification of Letters Patent. Application filed January 9.4907. Serial No. 351.489.

Patented Feb. 25, 1908.

this spark requires a source of electrical energy 1n connection with a low tension or high tenslon coil, according to the form of engine. In the drawing I have shown the engine operated by a high-tension non-vibrating 0011, 8,

connected with a battery, 6, whose current flows through the line 11 to the switch 7, thence by theline 16 through the primary winding of the coil 8 and the line 13 to the insulated contact 26 upon the engine 9, thence through the movable contact 17, when the cam upon the engine shaft raises 17 and causes the two to meet, to the engine frame; and from this frame through the line 12 back to the battery 6, forming a complete circuit through the coil 8. \Nherf the cam upon the engine shaft passes the contact 17 and allows 1t to separate from the stationary point 26 this circuit through the primary coil of the induction coil is suddenly broken and a momentary current of high potential is induced in the secondary windings of the coil that flows through the line 14 to the spark plug 27, in the engine, and jumps across the gap in the plug to the frame of the engine, thence comprleting the high potential circuit from the ame through the line 12 to the battery 6, thence through the line 11, switch 7, line 16 to the primary winding of the coil 8, then to the secondary winding connection, producing a spark within the cylinder at the proper time to ignite the mixture and operate the engine. This spark of ignition is produced at each separation of the contacts 17 and 26 and causes the engine to run continuously until the switch 7 is opened and the battery circuit broken, or the current from the battery is diverted from the coil 8.

' To the contact 5, which is insulated from the speed indicator 1,-is attached the conductor 10, whichextends to the pole of the battery, 6, that is not directly connected with the frame of the'engine and the metallic cas- Y the index 4 will meet the contact point 5,

- short circuit, the amount of current flowing creased until a rate of miles is reached then close the'shunt circuit and short circui the battery. As the resistance of the initial or coil circuit is much greater than the shunt or through the initial circuit, when the shunt circuit is closed, will not be-suflicient to operate the coil, hence there will not be an spark within the cylinder and the engine wil be deprived of its power. The moment the power is cut off the engine begins to slow down, and when its speed has been'reduced below the rate of 25 miles per hour the index 4 separates from the contact oint 5, opens the shunt circuit and allows the battery current to flow through the coil and produce the spark in the engine; thus reproducing the power before the engine has had time to stop or be reduced very much in speed. By this means the engine will be enabled to keep an approximate speed of 25 miles per hour and never exceed t is speed.

It will be understood that the index, its supporting rod, and all connecting arts in the speed indicator are of metal, an form a conductor for the shunt circuit when the index meets the contact point 5.

What I claim as m invention and desire to secure by Lettersatent is a 1. In an electrically ignited explosive engine, a primary circuit, means for shunt ng theprimary current from its circuit, cons1sting of a speed indicator; a-movable index, a contact point adapted to be set at any point upon the indicator scale, in the path of the index;. and an electric circuit, in multiple with the primary circuit, including the contact point and the index.

2. in combination, with an instrument 'for indicating the speed of a vehicle propelled by an electrically ignited explosive engine, a movable index, a contact point adapted to be set at any oint upon the indicator scale, in the path 0 the index; a rimary circuit, an electric circuit, in multip c with the primary circuit, including the contact point and the index, the index shunting the primary current when it'meets the contact point.

Signed at the city of New York in the county of New York and State of New York this 8th day of Jan. A. D. 1907.

FREDERIG STANTON PERRIN. Witnesses:

M. J. PERRIN, HAROLD C. DAYTON. 

